One part of the 4680 ramp is a manual process which is tricky to master.
They showed yield rates for various lines at Kato Rd sometime ago, one line with very poor yields was new staff for the Austin lines training.
It is likely that the process needs, vision, dexterity, speed, timing and concentration.
I had a thought last night, why not try to train Optimus to do this job?
It is likely that the speed, concertration and fatigue are no issue for Optimus.
Sure this is a tough challenge, but it will stretch the boundaries of what Optimus is capable of.
The advantages in terms of ramping cell production at new factories are odvious.